2006 Hummer H2 Owner's Manual - Page 107

The transfer case is a part of the Full-Time Four-Wheel Drive system and allows the following four different modes of operation: 4 m (Full-Time Four-Wheel Drive): This setting is used for driving in most street and highway situations. You can also use this setting for light or variable off-road conditions. 4 m Q (Four-Wheel-High Lock): Use this mode when you need extra traction in most off-road situations such as sand, mud, snow, or level, rocky trails. 4 n Q (Four-Wheel-Low Lock): This mode delivers extra torque to all four wheels and is used for extreme off-road conditions. You might choose Four-Wheel-Low Lock if you are driving off-road in deep sand, mud, or snow and climbing or descending steep hills. When in this mode you can also choose to lock the rear axle for additional traction in extreme off-road situations. See Locking Rear Axle on page 4-10. Notice: Operating your vehicle in Four-Wheel-Low Lock above 50 mph (80 km/h) for any extended period of time could cause damage to the transfer case. Do not operate your vehicle in Four-Wheel-Low Lock above 50 mph (80 km/h) for extended periods. {CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P). You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in NEUTRAL. See Parking Brake on page 2-34. N (NEUTRAL): Shift the vehicle's transfer case to NEUTRAL only when towing your vehicle. See Recreational Vehicle Towing on page 4-60 or Towing Your Vehicle on page 4-59 for more information. 2-31